1#!/usr/bin/perl -w 2# 3# headers_install prepare the listed header files for use in 4# user space and copy the files to their destination. 5# 6# Usage: headers_install.pl readdir installdir arch [files...] 7# readdir: dir to open files 8# installdir: dir to install the files 9# arch: current architecture 10# arch is used to force a reinstallation when the arch 11# changes because kbuild then detect a command line change. 12# files: list of files to check 13# 14# Step in preparation for users space: 15# 1) Drop all use of compiler.h definitions 16# 2) Drop include of compiler.h 17# 3) Drop all sections defined out by __KERNEL__ (using unifdef) 18 19use strict; 20 21my ($readdir, $installdir, $arch, @files) = @ARGV; 22 23my $unifdef = "scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__"; 24 25foreach my $file (@files) { 26 my $tmpfile = "$installdir/$file.tmp"; 27 28 open(my $in, '<', "$readdir/$file") 29 or die "$readdir/$file: $!\n"; 30 open(my $out, '>', $tmpfile) 31 or die "$tmpfile: $!\n"; 32 while (my $line = <$in>) { 33 $line =~ s/([\s(])__user\s/$1/g; 34 $line =~ s/([\s(])__force\s/$1/g; 35 $line =~ s/([\s(])__iomem\s/$1/g; 36 $line =~ s/\s__attribute_const__\s/ /g; 37 $line =~ s/\s__attribute_const__$//g; 38 $line =~ s/^#include <linux\/compiler.h>//; 39 $line =~ s/(^|\s)(inline)\b/$1__$2__/g; 40 $line =~ s/(^|\s)(asm)\b(\s|[(]|$)/$1__$2__$3/g; 41 $line =~ s/(^|\s|[(])(volatile)\b(\s|[(]|$)/$1__$2__$3/g; 42 printf {$out} "%s", $line; 43 } 44 close $out; 45 close $in; 46 47 system $unifdef . " $tmpfile > $installdir/$file"; 48 # unifdef will exit 0 on success, and will exit 1 when the 49 # file was processed successfully but no changes were made, 50 # so abort only when it's higher than that. 51 my $e = $? >> 8; 52 if ($e > 1) { 53 die "$tmpfile: $!\n"; 54 } 55 unlink $tmpfile; 56} 57exit 0; 58